[llvm] [AMDGPU] Enable "amdgpu-uniform-intrinsic-combine" pass in pipeline. (PR #162819)

[Pankaj Dwivedi via llvm-commits]

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@@ -148,6 +148,62 @@ static bool runUniformIntrinsicCombine(Module &M, ModuleAnalysisManager &AM) {
   return IsChanged;
 }
 
+// Legacy PM version
+static bool runUniformIntrinsicCombine(Module &M, ModulePass &P) {
+  bool IsChanged = false;
+  ValueMap<const Value *, bool> Tracker;
+
+  for (Function &F : M) {
+    switch (F.getIntrinsicID()) {
+    case Intrinsic::amdgcn_permlane64:
+    case Intrinsic::amdgcn_readfirstlane:
+    case Intrinsic::amdgcn_readlane:
+    case Intrinsic::amdgcn_ballot:
+      break;
+    default:
+      continue;
+    }
+
+    for (User *U : make_early_inc_range(F.users())) {
+      auto *II = cast<IntrinsicInst>(U);
+      Function *ParentF = II->getFunction();
+      auto &UI = P.getAnalysis<UniformityInfoWrapperPass>(*ParentF)
+                     .getUniformityInfo();
+      IsChanged |= optimizeUniformIntrinsic(*II, UI, Tracker);
+    }
+  }
+  return IsChanged;
+}
+
+namespace {
+class AMDGPUUniformIntrinsicCombineLegacy : public ModulePass {
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PankajDwivedi-25 wrote:

I think its ok to have separately. Initially, it was part of the base PR. after reviews I dropped it.

https://github.com/llvm/llvm-project/pull/162819